Magneto



J. R. STARK Jupe 9, 1925.

MAGNETO iled Nov. 19. 1,921

- 2 Sheets-Sheet 1 www June 9, 192s.

J. R. STARK UAGNETO med Nov. 19, 1921 Patented June 9, 1925.

UNITED STATES PATENT OFFICE.

.Io'HNRoY STARK, or IACINE, wIsC'oNsIN; AssIGNoR To wBsrEn ELECTRIC CoM- PANY, F RACINE, WISCONSIN, A CORPORATION 0F WISCONSIN.

Application led November 19,119.21. Serial No. 516,270.

To all Iwlw/ny it may concern:

Be it known that LvJonN Bor STARK, a citizen of the UnitedStates`v and resident of Racine, in the county of Racine and State of 'isconsin, have invented a certain new and useful Improvement in Magnetos, of `whichthe following is a fiilhclea-r, concise, and exactdescription, reference bein had to the accompanying drawings7 forming a part of this specification,

This invention relates to magneto generating devices, such as are commonly employed to ignite the charges in the cylinders of in -ternal combustion engines, and isparticularly concerned with an arrangementof this character in which a device commonly called an impulse starter is employed.

In the drawings: y

y Figure 1 is a longitudinal vertical section through the device; l

Figure 2 is a view substantially on the line 3-3 of Figure 1, looking in the direction of the arrows;

Figure 3 is a view looking toward the right end of the device,.as seen in Figure 1, with the end member of the frame removed; and y Figure 4 is a verticalsection substantially on the line 5 5 of F igure 1, looking in the direction ofthe arrows. Y

The object of the present inventionl is to provide a device of thel above character which shallbe compact, shall consist of relatively few parts, and the assembly of the parts shall be such as to reduce to the minimum the probability of their becoming displaced and rendered inoperative. y f

A feature of the invention is the pro,- vision cfa device of the above character which is self-contained and wherein ythe .pinion or pulley for transmitting rotary motion to the rotor ofthe magneto may be mounted directly on the shaftl projecting from the magneto housing. y

A further feature of the invention and one contemplated by the feature above noted is the provision of a device of this character in which the number of fixed bearings is reduced to a single bearing at each end of the rotor shaft. g 4 y .y

A still further feature of the invention is the provision of telescopically arranged shaft elements which will permit the rotary movement of the rotor andv its shafty in rela tion to the driving shaft without permitting said shafts to get out of alignment. A

Other features andl advantages ofthe i-nventi'on will appear as the description of the device progresses. y p

Referring knowto the ,drawingsy 1 indi- Cates the usual permanentmagnet, the free ends of'which extend longitudinally and engage opposite sides yof the base member 2 which may consist of any suitable non-magnetic material. In engagement with the inner surfaces of the legs of the magnety 1 are thek pole pieces 3 and 4. These pole pieces may be cast within the base member 2, as disclosed in applicants prior applicationy Serial No. L105,959, iled August 25, 1920. The base member 2 has laterally extendingflanges 5 provided with perfora- .tions 6y by means of which the magneto may be secured in place.

Mounted within the cylindrical s ace formedrby the pole pieces 3 and, 4 an lthe adjacent portions of the base member 2 is the rotary element of the magneto. This rotary element may be of any preferred construction, but, as shown in the present application, it consists of a plurality of substantially I-shaped strips or plates 7 of magnetizable material which are secured in fixed relation by means of the rivets or other securing devices 8. Mounted within the rectangular spaces within the sides of the strips 7 are a pair of insulating channels 9 and 10, of fibre or other material, about which the insulated wire forming the coils of the rotor is wound. In order to prevent `undue s reading of the coils beyond the laminae 2, the pinsy 11 are provided. Extending centrally through the lamina) 7 is the rotor shaft 12.

Fixed to theshaft 12in any desired manner, at one end of the windings or coils 13, is a disc 14 of conducting material to which is secured onere/nd of tliewiie forming the windings or coils The shaft12 atthc left end thereof, as viewed in Figure 1 is centrally bored, as at 15, to receivey the conducting pin 16, a sleeve 17 of insulating` material being provided between the shaft and the pin 16. A conductor 18 passes through anv opening in the shaft 12 and is electrically joined to the pin 16. This conductor 18 joins the pin 16 'to one end of the wire forming the Thus one end ol' the wire Vtorm- .ing the coils 13 is joined to the plate 14; and the other end ol the wire is joined to the pin 10.r it being understood, oit course, that the conductor 1S is insulated trom the shaft 12.

Arranged adjacent to one edge ot'. the permanent magnet 1 is an end piece 10 provided with an outwardly curved flange 20. The [lange 20 is provided with a channel 21, within which may be positioned telt or similar material 22 tor engaging with the edge et the magnet 1. The end member is also provided with a shouldered depression 223 which receives a flange 24 projecting Vtrom the hase member The end piece 10 is provided, opposite the base member'j with the annular llange 25.

Centrally located within the annular flange and connected thereto by the web is a liearing seat 2T. lVithin the bearing seat 2T is the bearing 2S ol any desired material which receives one end ot the rotor sha'l't 12.

Supported by this web member is a spring pressed brush which bears against the dise 1-1- and thus forms the other outletterminal` for the rotor windings or coils 13. l have not shown this arrangement ot brush, as it forms no important part of the present invention.

Non-rotatably secured to the reduced end ot the shaft 12, as by the spline 33 and the nut 31, is the cam which causes the opera` tion ot' the iuterrupter contacts olf the magneto. 'rlheinterrupter mechanism is housed in the space enclosed by the flange 27 and a sheet metal cover 70, which cover lits orer the flange This interrupter mechani terms no important part ot the present invention and consequently 1 shall not describe the same.

The transformer coils and the condenser ot the -magneto are mounted in the space within the upper halt ot the magnet 1. The primary winding, or windings, ot this transformer are connected with the rotor wind ings and with the niterrupter mechanism through conventional leads. the connections ot which constitute ne part of the Dres .it invention. A

vThe end member 10 is provided with the oil cup which communicates through the coils 13.

downwardly extendingopening 90 with a.

circular groove 0T. Tithin the outer surface ot the hearing member 2S groove 97 communicates with the lubricating wick 9S.

YWe will now describe the portion ot thel device which includes the impulse starter mechanism. The end otl the rotor opposite that already described is provided with the end piece or plate 99. which is provided with the outwardly and then inwardly extending flange 100. The tlange at its inner edge is provided with the bearin lsupport 101. "within which is the bearing member 1in?, ol'

any suit-able material. The rightJ end of the shalt 12, as viewed in yFig. l, has` a reduced portion 1021, to which, adjacent. the rotor coils, is rigidly secured the collar 101. YRigidly secured to the collar 104 in any desired manner is the plate 1.05. The plate .105 is provided at diametrically opposite sides thereot with the laterally extending lugs 100 and 107 (see Fig. Concentricallv arranged about the reduced portion 103 ot' the shalt 12, and within the bearing 102. is the drive shaft 10S. Rigidly secured to the inwardly7 extending end of the sha'tt 10S. i' any desired manner. is thc plate 100. The plate 109 is provided with tour laterally extending flanges 110 (see Fig. and a pair ot radially extending arms 111. The tour laterally extending flanges 110 combine to form a drum about which is arranged the clock spring 112, one end of which is secured to one ot the tlanges 110, the other end being secured to the tlange 106 which projects trom the plate secured to the rotor shalt.

Projecting from the plate 105 secured to the rotor is a bearing lug 113. Pivotally supported on the bearing lug 113 is a pawl or detent 111, having the weighted end 115. Extending outwardly from the plate 109, which is secured to the sleeve shaft 108, is a pair ot' lugs 11G and 117, the purpose for which will presentlyy appear. Secured to the end piece 99, as by the screws 11S, is an abutment or stop plate provided with a shoulder arranged to he engaged by the dctent 114. Non-rotatably lixed to the outwardly extending portion ol' the sha't't .109. as b v the spline 121 and nut 122, is the gear wheel 1225, by means ot which rotary movement is transmitted to the rotary element; of the magneto. An oil cup 124; is provided which connnunicates through the opening 125 and the arcuate grooves 120 with the lubricating wick 127. The right cnd ot thc libre or paper lining 81 of the receptacle 0S is closed by means ot ablock 128 of libre or other material which. is secured to the lining 84 by means of screws 129 which are re ceived by the threaded lugs 1130 secured te the lining Se. The end strip 09 is prov ,.il Josite the plate 12S with the spring mein-- ber 1551, the 'inwardly extending ends o1 which are arranged to engage the plate 12S when the end member 90 is in position. The member 00 is secured in position on the hase member h v tour screws 1212. cach ot' which passes through an opening in the end plate and is received by a threaded opening in the base member 2.

lVhen the device is in operation, power is transmitted from a rotary element et the engine` through any suitable medium, to the gear or pulley 121:3, thus causing' the shaft 10S to be rotated. t all normal speeds ot rotation, the rotor shalt 12 rotates with .shalt 10S. due to tlul tension ol the spring 112, whjehjV tends lqiltainthe 106carried by the plate'105 fixed to the rotor in engagement, with.firearmL 11,1 Vcarried by the plate 109 fixed `totheudrivnig shaft 108. When, however, the Shaftlflis rotated f at a very slow speed, as when the4 engine is bein started, the ypawlk 114which Yis xed to yt 1e rotor ,element ,through the mediumy of the lug 1,13 and' plate `10.5, will engage the abutment 1.20 and te ""rarily preyent rotationof tl'ierotor. 'I e continuedv rotation of thev shaft 108 noipacts `to tension the spring 112. is the shaft 108continues to rotate, theulug 117 `,carri'fz'd by the plate 109 engages thepweighted-,end `1155 of the` aw] and yforces the` detent portion 114v out 0 engagement with'theabutment 120, and permits the rotor to be rapidly rotated, due to the energy which has been rstored, in the spring 1,12. On release, the rotary movement of the rotor is terminated by the lugs 106 and 107, projecting from the edges of the plate 105, coming into engagement with the radially extending arms 111 carried by the plate 109. This rapid rotation of the rofor through a portion of a revolution acts to create a high potential in the secondary and thus produces a spark of suflicient intensity to ignite the charge in the cylinder of the engine. The engagement of the detent with the abutment 120 is brought about due to the action of gravity on the weighted end 115 of the detent. The detent 114 is so positioned in the magnetic field that the magnetic attraction does not resist the outward movement of the detent 114, but on the contrary may be employed to slightly assist auch movement. When operating at higher speeds, as when the engine is running, the centrifugal force acting on the Weighted end 115 of the detent forces the operative end of the detent inwardly out of the path of the abutment 120.

It will thus be seen that in the structure above described, a magneto having an impulse starter has been provided which, from all external appearances, is similar to a magneto having no impulse starter. The bearings for the magneto shafts are contained in the end plates, and the driving gear or pulley is mounted directly on the end of the shaft projecting through one of the end plates.

In the structure described, the telescoping arrangement of the end of the driven shaft within that part of the driving shaft, which is received by the bearing, practically as sures that the two shafts will be maintained in alignment, and by this structure the possibility of the operative parts of the resilient coupling between the two shafts being displaced is reduced to the minimum.

Although but a single embodiment of the invention is disclosed in the drawlin s and specification, it is to be underst that 1. In a magneto, a driving shaft, a disc fixed thereto, laterally extending flanges on said disc, aspring positioned about s aid lflanges,a driven shaft, a plate fixed thereto adjacentand, substantially parallel to said disc, ,and a laterally extending finger carried by said plate arranged toy overlie ysaid flanges, onel end of said spring being attached ,toene of said flanges, and the other end to said finger. I l j ,4 ,2. In a magneto, a driving shaft,a disc fixed thereto, laterally extendingflangeson saiddisc, a s v)ring wound about said Hanges, a driven sha t, a plate fixed theretoadjacent and'` Lsubstantially parallel to said disc, a laterally ,extending finger' Crredbi Said plate arranged to oveille said flanges, one end of said spring being attached to one of said flanges, and the other end to said finger, and a radial extension on said disc adapted to co-operate with said finger to maintain said disc and plate in normal relative position.

3. In amagneto, a driving shaft, a disc fixed thereto, laterally extending flanges on said disc, a spring wound about said flanges, a driven shaft, a plate fixed thereto adjacent and substantially parallel to said disc, a laterally extending finger carried by said plate arranged to overlie said flanges, one end of said spring being attached to one of said flanges, and the other end to said finger, a pawl carried by said plate, -a fixed stop arranged to be engaged thereby, and means on said disc for disengaging said pawl from said stop.

4. In a magneto, a driving shaft, a disc fixed thereto, laterally extending flanges on said disc, a spring wound about said flanges,

a driven shaft, a plate fixed thereto adjacent and substantially parallel to said disc, a laterally extending finger carried by said plate arranged to overlie said flanges, one end of said spring being attached to one of said flanges, and the other end to said finger, a radial extension on said disc adapted to co-operate with said finger to maintain said rdisc and plate in normal relative position,

a pawl carried by said plate, a fixed stop arranged to be engaged thereby, and means on said disc for disengaging said pawl from said stop.

In a magneto, a driven shaft, a driving shaft, cover or end plates, one for cach end of said magneto, bearings, one in each of said plates, said driving shaft being arranged to project through one of said bearings, one end of said driven shaft being ar ranged to project into the other said bearing, the other end of said driven shaft being telescopically arranged within a portion of said drivingy shaft a dise fixed to said driving shaft` a plate fixed to said driven shaft7 and a spiral spring positioned about said shafts having one end secured to said disc and the other end to said plate.

G. In a magneto, a driven shaft, a driving@T shaft. cover or end plates, one for each of .said magneto, aligned bearings, one in each of said plates, one end of said driven shaft being` arranged to project through one of said bearings, said driving shaft being received b v the other said bearing', the other end of said driven shaft beingtelescopically arranged Within said driving shaft. a dise fixed to said driving` shaft, a plate ixed to said driven shaft7 and a spring positionedof said magneto, bearings7 one in each of' said plates7 said driving shaft being arranged to project through one of said be; ings. one end of said driven shaft beingr arranged to project into the other said b xaring7 the other end of said driven shaft being?r teleseopically arranged ivithin a portion of said driving shalt7 a dise fixed to said driving shaft, laterally extending flanges on said disc, a .springr positioned about said flanges, a plate lixed to said driven shaft, and a laterallyv extending4 linger carried by said plate, one end of said spring being attached to said linger7 the other end of said spring beiner attached to one of said flanges. In witness whereof, I hereunto subscribe nrv nalne this 10th dav of November. 1921.

Jo'iix nov STARK. llfvitnesses:

E. DI. RAY, B. MILLER. 

